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Among the enhancements reflected in the Next Generation Li-ion Calorimeter is a rigidly wired system that allows direct mounting of thermocouples into key component locations to better capture thermal signature data during testing and improve thermocouple reliability. The ejecta mating chambers have also been modified for better thermal containment and easier system disassembly. Additionally, the system facilitates an easier access, user-friendly Destructive Physical Analysis (DPA) process between uses, and reflects durability improvements in the face of repetitive heat cycling. A clean-sheet redesign was undertaken to create a configurable insula-tion case with an interchangeable “window” section, tailored to the ex-perimental environment. For NASA’s Energy Systems Test Area (ESTA) evaluation, a window with the original foam is installed to maintain ther-mal insulation performance. In contrast, for synchrotron experiments, this section is replaced with an aluminum window that eliminates foam-related X-ray scattering. This modification has substantially improved X-ray radiography resolution, enabling clearer imaging of fine internal battery features during thermal runaway events. Moreover, the insulation case was designed to provide system fire-proofing for both the chamber and pouch cell testing case configurations. Lastly, a control switchbox is also being developed to work with the latest generation calorimeter. It allows users to remotely operate the TR trigger mechanism from a control room, automatically terminate power in a prescribed amount of time to prevent a fire caused by overheating, and provides lit indicators to inform the user of ready or fault states.